?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=MAMMAR%2C+AMEL&rft.aulast=MAMMAR&rft.aufirst=AMEL&rft.atitle=Modeling+a+Landing+Gear+System+in+Event-B&rft.genre=article